package com.rpc.demo.common.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @Author: ZhaoJie
 * @Date: 2022/4/7
 * @Description: rpc通信中通过class名字获取对应的bean实例
 * @Modify: ===================================================
 * Modifier        Modifytime        Description
 * ===================================================
 */
@Component
public class ApplicationContextGetBeanHelper implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public static Class getBean(String className) throws BeansException,IllegalArgumentException {
        if(className==null || className.length()<=0) {
            throw new IllegalArgumentException("className为空");
        }

        String beanName = null;
        if(className.length() > 1) {
            beanName = className.substring(0, 1).toLowerCase() + className.substring(1);
        } else {
            beanName = className.toLowerCase();
        }
        return applicationContext != null ? applicationContext.getType(beanName) : null;
    }

}

